You can only do it if you create the page in Documents. create a new folder and place both the page and the sound file in it. somewhere on the page, place the following:
<EMBED HIDDEN="true" AUTOSTART="true" WIDTH="60" HEIGHT="144" SRC="MY TUNE" LOOP="true" REPEAT="true"></EMBED>
If you don't want to see the controls, insert the following:
<EMBED HIDDEN="true" AUTOSTART="true" HIDDEN="true" WIDTH="60" HEIGHT="144" SRC="MY TUNE" LOOP="true" REPEAT="true"></EMBED>